Imported fbx with armature behaves weird in blender
Have you tried Makehuman (http://makehumancommunity.org) or Manuel Bastioni Lab (http://www.manuelbastioni.com) these plugins are both free and Manuel Bastioni is fully integrated inside Blender, is really worth to check it out. 

I had a similar issue importing FBX poses from Mixamo, the bones came all wrong, so what I did was:

1- import the pose without skin from mixamo into blender. 

2- export that same pose as a BVH file from blender. (Can you export BVH from DAZ Studio?)

3- import a character from Makehuman into blender then apply the BVH to this character. 

Hope it helps.